Hi,
Why do u need that big (5cm x 5cm) dual h-bridges when u can get it in a single chip L298. You can give 1 1 input to them to cause breaking effect in the motor. Each h bridge can drive 2A and u can get 4A by connecting 2 h-bridge on L298 in parallel. And L298 costs around Rs.120 .
Please let me know if the big h-bridge board has special features or extra advantage.